#include "mymath.h"


int myerrno = 0;

int add(int x, int y)
{
    return x + y;
}

int sub(int x, int y)
{
    return x - y;
}

int mul(int x, int y)
{
    return x * y;
}

int div(int x, int y)
{
    if(y == 0)
    {
        myerrno=1;
        printf("error code: %d\n", myerrno);
        return -1;
    }
    return x / y;
}
